NEW:

-Added a new sensor(Awareness);
  With this new sensor the NPC is now able to find new spots while in
  action;

CHANGES:

-Added 2 conditions:

 CheckTargetState condition: While in combat the npc knows the state of
 the target, for example if the target is reloading, shooting, aiming or out
 of bullets.

 TryToFindCoverLocation: This condition will provide if the NPC is in
 combat, the NPC will try to Find cover spots using the Awareness Sensor.

- Added two child GameObjects to the NPC Prefab one for each sensor in
  order to organize better the script structure;

FUTURE CHANGES:

-Implement the transition action to Cover State;
-Add Actions to cover state;
-Add Animations to cover state;

-Added HealthSystem interface script;